MyEnergyPal » replace furnace http://myenergypal.com Save energy - Save money Mon, 19 Apr 2010 13:43:04 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 How Much Money Can I Save by Replacing My Furnace? http://myenergypal.com/how-much-money-can-i-save-by-replacing-my-furnace/ http://myenergypal.com/how-much-money-can-i-save-by-replacing-my-furnace/#comments Wed, 30 Dec 2009 14:54:34 +0000 Ed Szajniak http://www.myenergypal.com/?p=428 “How much money can I save if I replace my furnace?” is question people ask me most often.

To figure that out, you need to know your annual fuel cost, the type of heating technology you are currently using and the type you plan to use.

AFUE (annual fuel utilization efficiency)  ratings for common systems are shown below.

Annual savings =  A -B x C

A= Seasonal efficiency of proposed system

B= Seasonal Efficiency of current system

C= annual fuel cost for heating

Example: You have a conventional gas furnace and are converting to a high efficiency gas furnace. The conventional furnace has an AFUE ( annual fuel utilization efficiency) of 60% . The high efficiency furnace has an AFUE of 96%. The annual heating cost id $1200.

Savings =  96 – 60 x 1200   =$450.00

Your annual savings would be $450.00 plus you eliminate the need for a chimney.

Typical Heating System Efficiencies and Energy Savings

Energy Source Technology Seasonal
Efficiency
(AFUE) %		 Energy Savings (% of Base’)
Natural Gas • Conventional furnace boiler 60 Base

• Standard-efficiency furnace 78-84 23-28

• Standard-efficiency boiler 80-88 25-32

• Condensing furnace 90-97 33-38

• Condensing boiler 89-99 33-39

• Integrated space/

33-38 space

tap water condensing 90-96 44-48 water
Propane • Conventional furnace/boiler< 62 Base

• Standard-efficiency furnace 79-85 21-27

• Standard-efficiency boiler 82-90 24-31

• Condensing furnace 88-95 29-34

• Condensing boiler 87-97 29-36
Oil • Cast-iron head burner(old furnace) 60 Base

• Flame-retention headreplacement burner 70-78 14-23

• High-staticreplacement burner 74-82 19-27

• New standard model 78-86 23-30

• Standard-efficiency 83-89 28-33

• Integrated space/tap water

28-33 space

standard-efficiency 83-89 40-44 water
Electricity • Electric baseboards 100 N/A

• Electric furnace or boiler 100

• Air-source heat pump 1.7 COP’

• Earth-energy system

(ground-source heat pump) 2.6 COP’

Wood • Central furnace 45-55 N/A

• Conventional stove(properly located) 55-70

• “High-tech” stove’ (properly located) 70-80

• Advanced combustion fireplace’ 50-70

• Pellet stove 55-80

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